605 static struct task_struct *find_child_reaper(struct task_struct *father,  in find_child_reaper()  argument
610 	struct pid_namespace *pid_ns = task_active_pid_ns(father);  in find_child_reaper()
614 	if (likely(reaper != father))  in find_child_reaper()
617 	reaper = find_alive_thread(father);  in find_child_reaper()
633 	return father;  in find_child_reaper()
643 static struct task_struct *find_new_reaper(struct task_struct *father,  in find_new_reaper()  argument
648 	thread = find_alive_thread(father);  in find_new_reaper()
652 	if (father->signal->has_child_subreaper) {  in find_new_reaper()
653 		unsigned int ns_level = task_pid(father)->level;  in find_new_reaper()
662 		for (reaper = father->real_parent;  in find_new_reaper()
681 static void reparent_leader(struct task_struct *father, struct task_struct *p,  in reparent_leader()  argument
699 	kill_orphaned_pgrp(p, father);  in reparent_leader()
710 static void forget_original_parent(struct task_struct *father,  in forget_original_parent()  argument
715 	if (unlikely(!list_empty(&father->ptraced)))  in forget_original_parent()
716 		exit_ptrace(father, dead);  in forget_original_parent()
719 	reaper = find_child_reaper(father, dead);  in forget_original_parent()
720 	if (list_empty(&father->children))  in forget_original_parent()
723 	reaper = find_new_reaper(father, reaper);  in forget_original_parent()
724 	list_for_each_entry(p, &father->children, sibling) {  in forget_original_parent()
727 			BUG_ON((!t->ptrace) != (rcu_access_pointer(t->parent) == father));  in forget_original_parent()
739 		if (!same_thread_group(reaper, father))  in forget_original_parent()
740 			reparent_leader(father, p, dead);  in forget_original_parent()
742 	list_splice_tail_init(&father->children, &reaper->children);  in forget_original_parent()